A constant force acts on a body of mass \(0.9\ \text{kg}\) at rest for \(10\ \text{s}\). If the body moves a distance of \(250\ \text{m}\), the magnitude of the force is:

1. \(3\ \text{N}\)

2. \(3.5\ \text{N}\)

3. \(4.0\ \text{N}\)

4. \(4.5\ \text{N}\)

A body of \(5\ \text{kg}\) is moving with a velocity of \(20\ \text{m/s}\). If a force of \(100\ \text{N}\) is applied to it for \(10\ \text{s}\) in the same direction as its velocity, what will now be the velocity of the body?

1. \(200\ \text{m/s}\)

2. \(220\ \text{m/s}\)

3. \(240\ \text{m/s}\)

4. \(260\ \text{m/s}\)

A cyclist turns around a curve at \(15\ \text{miles/hour}\). If he turns at double the speed, the tendency to overturn is:

1. Doubled
2. Quadrupled
3. Halved
4. Unchanged

If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be:
1. \(mg+\dfrac{mv^2}{r}\)
2. \(mg-\dfrac{mv^2}{r}\)
3. \(\dfrac{mv^2g}{r}\)
4. \(\dfrac{v^2g}{r}\)

A motorcyclist moving with a velocity of \(72\ \text{km/h}\) on a flat road takes a turn on the road at a point where the radius of curvature of the road is \(20\ \text{m}\). The acceleration due to gravity is \(10\ \text{m/s}^2\). To avoid skidding, he must not bend with respect to the vertical plane by an angle greater than:

1. \(𝜃=\tan^{−1}6\)

2. \(𝜃=\tan^{−1}2\)$\mathrm{}$

3. \(𝜃=\tan^{−1}25.92\)$$

4. \(𝜃=\tan^{−1}4\)$$

A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance \(r\). The speed of the particle is:

1. Proportional to \(r^2\)

2. Independent of \(r\)

3. Proportional to \(r\)

4. Proportional to \(\dfrac 1r\)

Two masses \(M\) and \(m\) are attached to a vertical axis by weightless threads of combined length \(l\). They are set in rotational motion in a horizontal plane about this axis with constant angular velocity \(ω\). If the tensions in the threads are the same during motion, the distance \(x\) of \(M\) from the axis is:

1. \(\dfrac{Ml}{M+m}\)

2. \(\dfrac{ml}{M+m}\)

3. \(\dfrac{M+m}{M}l\)

4. \(\dfrac{M+m}{m}l\)

A \(500\ \text{kg}\) car takes a round turn of radius \(50\ \text{m}\) with a velocity of \(36\ \text{km/h}\). The centripetal force is:

1. \(250\ \text{N}\)

2. \(750\ \text{N}\)

3. \(1000\ \text{N}\)

4. \(1200\ \text{N}\)

A ball of mass \(0.25\ \text{kg}\) attached to the end of a string of length \(1.96\ \text{m}\) is moving in a horizontal circle. The string will break if the tension is more than \(25\ \text{N}\). What is the maximum speed with which the ball can be moved:

1. \(14\ \text{m/s}\)

2. \(3\ \text{m/s}\)

3. \(3.92\ \text{m/s}\)

4. \(5\ \text{m/s}\)

A body of mass \(5\ \text{kg}\) is moving in a circle of radius \(1\ \text{m}\) with an angular velocity of \(2\ \text{rad/s}\). The centripetal force is:

1. \(10\ \text{N}\)

2. \(20\ \text{N}\)

3. \(30\ \text{N}\)

4. \(40\ \text{N}\)